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The Boostmonster! - 300mm Frankenbike - Worlds Greatest DH Bike?

May 11, 2022 at 17:12
by Jordan Boostmaster  

As the Bike industry goes longer lower slacker, I am going higher, heavier and sendier.

This bike has been a big project I have been working on for quite a while now perfecting and tuning up to my liking.
The 'Boostmonster' is a frankenbike that features a 2005 Norco A-line frame and a 2003 Marzocchi Supermonster 300mm fork.
I also put a larger 10.5x3.5 shock onto it to add to the rear travel, (stock is 9.5x3.0) the rear travel is now about 279mm.


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Boostmonster Geometry:
BB height: 423mm
Wheelbase: 1228mm
Front centre: 794mm
Chainstay length: 435mm
Reach: 365mm
Stack: 637mm
RAD: 835mm
64.5 degree headtube angle

Weight 49lbs

The use of the 2005 Norco A-line was not my original idea, I have been talking with bipolarexpress a lot in getting advice on this build, you may have seen some of his articles here in the past.

Finally all done Norco A-Line Marzocchi Super Monster Seismic Industries Hubs Shimano Airlines Azonic Love Seat Grimeca System 17. It s been some years of crazy hucking.
I am basically copying him with this idea, but I am coming at this build from a bit of a different angle, I am not as concerned with keeping it oldschool, but rather squeezing every last bit of performance out of this supermonster, so I am putting all my favorite modern components on here.

I am going with 26" wheels for now, but will also try a 24" wheelset soon and really see what I like best for this build.

Boostmonster
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The 2003 Marzocchi Supermonster is the star of the show

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Chromag OSX LTD polished handlebar, Hope Tech 3 V4 brakes, ODI grips with custom engraved lizard skin rings, Chris King headset

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Saint Drivetrain 7 speed, hope pro 4 hubs laced to DT Swiss FR 560 rims, STFU system

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Stock Truvativ cranks with Straitline pedals and bashguard

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shuttling at Vedder
I currently have a Fox Van R rear shock and I fit on a 500lb spring. Schwalbe Magic Mary tires (tubeless front, tube rear)


I hired Andrextr to analyse the bike so I could understand how the rear suspension works.

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The blue Line in the progression image represents the 9" travel position, and the orange line shows the 8" travel position


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We added more rearward wheel movement with the longer shock, which also made the chainstay length a bit shorter



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Last year I started this build with a beautiful stock 2005 Norco A-line, see that video here:


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It was really fun on Jolly Rancher at Bear mtn, this bike needs really gnarliest trails and big hits!

The Boostmonster

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Author Info:
boostmaster avatar

Member since Mar 8, 2008
46 articles

2 Comments
  • 2 0
 This is such a sick bike! Would love to ride it
  • 1 0
 you need a float x2 in 10.5x3.5.







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